Title :
A 21.6μW inductively powered implantable IC for blood flow measurement
Author :
Khannur, Pradeep Basappa ; Chan, Kok Lim ; Cheong, Jia Hao ; Kang, Kai ; Lee, Andreas Astuti ; Liu, Xin ; Lim, Huey Jen ; Ramakrishna, Kotlanka ; Je, Minkyu
Author_Institution :
Inst. of Microelectron., A*STAR (Agency for Sci., Technol. & Res.), Singapore, Singapore
Abstract :
This paper presents a fully integrated inductively powered implantable circuits for blood flow measurement, which are embedded within vascular prosthetic grafts for early detection of graft degradation or failure. The ASIC interfaces with micro-fabricated pressure sensors and uses a 13.56MHz carrier frequency for power transfer and command/data communication. A backscatter-modulated passive telemetry is used for transmitting sensor readout information to an external monitoring device. The chip has been fabricated in 0.18μm CMOS process, occupies a total active area of 1.5×1.78mm2 and consumes a total power of 21.6μW. The rectifier achieves an efficiency of 66% The sub-μW 10-bit SAR ADC achieves an ENOB of 8.5 bits at 106KS/s conversion rate.
Keywords :
CMOS integrated circuits; application specific integrated circuits; biomedical telemetry; blood flow measurement; lab-on-a-chip; prosthetic power supplies; rectifiers; ASIC; CMOS process; backscatter-modulated passive telemetry; blood flow measurement; command communication; data communication; external monitoring device; frequency 13.56 MHz; graft degradation; inductively powered implantable IC; microfabricated pressure sensors; power 21.6 muW; power transfer; rectifier; sensor readout information; vascular prosthetic grafts; Application specific integrated circuits; Blood flow; Clocks; Prosthetics; Rectifiers; Sensors; Switches;
Conference_Titel :
Solid State Circuits Conference (A-SSCC), 2010 IEEE Asian
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-8300-6
DOI :
10.1109/ASSCC.2010.5716602
